Crossfire 270 and 270x or 280

[JackSpeake]

Would it be possible to crossfire the Gigabyte Radeon R9 270 oc windforce edition with a 270x or higher quality (280x 290 etc)?

 

[haroldragaofficial]

Check this site. Should show compatibility
http://sites.amd.com/PublishingImages/Public/Graphic_Illustrations/WebBannerJPEG/AMD_CrossfireX_Chart_1618W.jpg